Add dynamic config JOBRESULT_RETENTION

and cleanup functionality to the housekeeping script

docs/administration/housekeeping.md

@@ -4,6 +4,7 @@ NetBox includes a `housekeeping` management command that should be run nightly.
 
 * Clearing expired authentication sessions from the database
 * Deleting changelog records older than the configured [retention time](../configuration/dynamic-settings.md#changelog_retention)
+* Deleting job result records older than the configured [retention time](../configuration/dynamic-settings.md#jobresult_retention)
 
 This command can be invoked directly, or by using the shell script provided at `/opt/netbox/contrib/netbox-housekeeping.sh`. This script can be linked from your cron scheduler's daily jobs directory (e.g. `/etc/cron.daily`) or referenced directly within the cron configuration file.
 

docs/configuration/dynamic-settings.md

@@ -43,6 +43,18 @@ changes in the database indefinitely.
 
 ---
 
+## JOBRESULT_RETENTION
+
+Default: 0
+
+The number of days to retain job results (scripts and reports). Set this to `0` to retain
+job results in the database indefinitely.
+
+!!! warning
+    If enabling indefinite job results retention, it is recommended to periodically delete old entries. Otherwise, the database may eventually exceed capacity.
+
+---
+
 ## CUSTOM_VALIDATORS
 
 This is a mapping of models to [custom validators](../customization/custom-validation.md) that have been defined locally to enforce custom validation logic. An example is provided below: